Hydrotherapy spa



FIG. 1 is a top perspective view of a hydrotherapy tub showing my new design;

FIG. 2 is a front elevation thereof;

FIG. 3 is a rear elevation thereof;

FIG. 4 is a left side elevation thereof;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a hydrotherapy tub, as shown. 